yc420

I recently purchased a 10 dollar breather filter from Advance Auto. It's red just like my car and it looks cool under my hood.

Take a look at the following pics. What I want to know is if it will do any harm/good to the motor or whatever. As far as I understand the tube that connects to the valve cover and the intake elbow right by the throttle body is just recirculating hot, unwanted air right back into my motor. With this breather filter I was hoping to recirculate that air into the atmosphere (engine bay). I know I took more pics than physically needed but whatever, the more, the better.








As you can see from the pics I plugged the inlet into the intake elbow and replaced the outlet on the valve cover with a breather filter.


Thanks in advance for any and all input,
yc420

I also apologize for the large pics. Please just bare with me.

Also, I have searched through a bunch of threads concerning this issue and I couldn't find a thread where they were in the exact same situation as I'm in.

yc420

bump lol I could use peoples input on this..

Nuke

What was your reasoning for doing that? I'm not sure of the impact as my Stang is presently not available for me to see for certain what it is you modified. Was that the exhaust gas recirculation?

howarmat

no no no.....you should not be putting "breathers" on these cars. The hose is part of the vacuum system created between the crankcase and intake/manifold. put the damn hose back on!

yc420

I understand that, but instead of it taking a little in from the intake elbow it gets a lot more from the engine bay. It's still "filtered" air. It's bringing in more air now than before because before it received its air through a little nipple inlet, now it's actually a small filter. I don't see how this could be so bad. Explanations would be great though.

ytix

You're halfway there: you need to add a breather filter to the other camshaft cover where I've circled in yellow below. If you do not your engine will be drawing unmetered air (bypassing the MAF sensor) into the intake, through the red breather filter. This will mess with your computer's attempt to nail down the air/fuel ratios and your car won't run as well. Not to mention that you will also be drawing more octane-lowering oily crankcase vapors as well.

Many others will extol the virtues of the Stef's catch-can and that's what I went with when I first got my stang. But I've since switched to the same breather filter you have on the passenger cam cover and a larger K&N breather filter for the 5/8" fitting on the driver's cam cover.

yc420

Do you have a picture of your exact set up? Would a catch can resolve the problem? What is there to be gained/lossed from a catch can set up etc. etc.

onederful100

both catch cans and oil separators trap unwanted blowby before they get recirculated back into your intake.

https://mustangforums.com/forum/4-6l...modaddict.html

GT John

Looks good.

There is nothing wrong with what you have done here, as long as your engine is tuned for the mod.

Right now you have what is called "unmetered" air entering the engine. The PCM has to know exactly how much air is being sucked into it. The reason for this is, the PCM calcualates the air entering the engine and this is converted to Load. Spark and fuel requirements are calculated from Load.

My car is tuned for this operation. I went a step further and ran a hose from the valve cover to the fender well and installed a filter on the end. I didnt want engine heat being sucked into the crankcase. I also installed a stefs 5122 inline on the drivers side to keep oil mist out of the intake.